Honeywell W7340 Product Data
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Honeywell W7340 Product Data

Communicating economizer logic modules for ventilation control
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W7340, W7345
Communicating Economizer Logic Modules
FOR VENTILATION CONTROL
W7340

APPLICATION

The W7340 Communicating Economizer Logic Module is a full
featured economizer that incorporates Demand Control
Ventilation (DCV) to provide free cooling and ventilation for
occupants in a space while saving energy.
The W7345 Communicating Economizer Logic Module is a
dry bulb only economizer that does not incorporate Demand
Control Ventilation.
The W7340 is used with both solid state temperature and
humidity or enthalpy sensors. The W7345 is used with solid
state temperature sensors only.

FEATURES

• Solid state control package provides accuracy,
reliability and stability.
• Housed in high-impact, glass-fiber reinforced plastic
case.
• Terminals included for connecting optional S963B1136
Remote Potentiometer for remote minimum damper
position control.
• Communicates using a modified Modbus protocol.
• Case matches the lines of the M7215 Damper Motor.
W7345
• LED indicates the status of the device input.
W7340 Only
• Operates from the Modbus input, environmental
sensors, and a DCV sensor to provide a totally
integrated control system.
• Combines minimum damper position potentiometer
with solid state temperature (10K NTC) and humidity or
enthalpy changeover control to provide economizer
free cooling function; this control can be overridden
by input via Modbus or DCV sensor.
W7345 Only
• Operates from the Modbus input and mixed/discharge
air sensor to provide a temperature control system.
• Combines the Modbus indoor and/or outdoor
temperature input with the mixed air input to provide
economizer dry bulb free cooling function.
Application.........................................................................1
Features ............................................................................1
Specifications ....................................................................2
Installation .........................................................................3
Wiring ................................................................................6
Operation...........................................................................7
Settings and Adjustment ...................................................7
Troubleshooting.................................................................11
PRODUCT DATA
Contents
63-2569-04

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Summary of Contents for Honeywell W7340

  • Page 1: Table Of Contents

    The W7345 Communicating Economizer Logic Module is a dry bulb only economizer that does not incorporate Demand Control Ventilation. The W7340 is used with both solid state temperature and humidity or enthalpy sensors. The W7345 is used with solid state temperature sensors only.

  • Page 2: Specifications

    If you have additional questions, need further information, or would like to comment on our products or services, please write or phone: 1. Your local Honeywell Automation and Control Products Sales Office (check white pages of your phone directory). 2. Honeywell Customer Care...

  • Page 3: Installation

    MOUNTING DIRECTLY TO THE MOTOR — 1. Mount the motor. 2. Secure the W7340 or W7345 to the motor using the supplied mounting screw (See Fig. 2). MOUNTING SEPARATE FROM THE MOTOR Secure the device to the sheet metal using appropriate fasteners (not supplied)(See Fig.
  • Page 4 W7340, W7345 COMMUNICATING ECONOMIZER LOGIC MODULES Fig. 3. Mounting to a Duct or Panel. Enthalpy Sensor (W7340 only) To measure enthalpy, the logic module accepts signals from either: — C7600C Humidity and 10K NTC temperature sensors. — or a C7400 Enthalpy Sensor.
  • Page 5 A C7600 HUMIDITY SENSOR, USED IN CONJUNCTION WITH A 10K NTC TEMPERATURE SENSOR CAN BE USED INSTEAD OF A C7400 ENTHALPY SENSOR. FOR DRY BULB CONTROL, USE ONLY A 10K NTC TEMPERATURE SENSOR. Fig. 4. Representative Locations of Connected W7340 Economizer System Devices. 10K NTC DISCHARGE...

  • Page 6: Wiring

    W7340, W7345 COMMUNICATING ECONOMIZER LOGIC MODULES WIRING CAUTION Electrical Shock or Equipment Damage Hazard. Can shock individuals or short equipment circuitry. Disconnect power supply before installation. 2-10 Vdc FEEDBACK OUTPUT – 2-10 Vdc FEEDBACK INPUT MIN POS/ DCV MIN POWER...

  • Page 7: Operation

    • Use C7400A sensor with W7340A or W7340B. • Use C7400C with W7340C. The W7340, when wired as shown in Fig. 6, responds to a signal from the Modbus. This system uses C7400 Solid State Enthalpy Changeover Sensor(s). The C7400 Enthalpy Sensors...
  • Page 8 1500 MBUS- MBUS+ TR1 24V COM TR 24V AC Fig. 9. Location of W7340 potentiometers and LED. IMPORTANT Before powering the device read the following Enthalpy changeover setpoint guidelines: 1. Using the Enthalpy changeover setpoint, the setpoint can be adjusted until three minutes after powering the device.
  • Page 9 NOTE: When using the W7340 for differential enthalpy, keep Exhaust Setpoint (W7340 only) The exhaust setpoint determines when the exhaust fan will run based on the damper position.
  • Page 10 APPROX. °F (°C) AT 50% RH APPROXIMATE DRY BULB TEMPERATURE— °F (°C) HIGH LIMIT CURVE FOR W7210D, W7212, W7213, W7214, W7340B. Fig. 10. W7340 Performance Characteristics for Enthalpy Changeover Settings. Table 3. W7345 Performance Characteristics for Temperature Changeover Settings. Approximate Control Point...

  • Page 11: Troubleshooting

    — In the event of a Communications Failure, the LED pulses on for 0.25 seconds every 2 seconds. W7340, W7345 COMMUNICATING ECONOMIZER LOGIC MODULES Table 4. W7340 Economizer Checkout. Description Booting (0-3 min. after power-up)
  • Page 12 W7340, W7345 COMMUNICATING ECONOMIZER LOGIC MODULES Automation and Control Solutions Honeywell International Inc. 1985 Douglas Drive North Golden Valley, MN 55422 customer.honeywell.com ® U.S. Registered Trademark © 2007 Honeywell International Inc. 63-2569—04 J.I. Rev. 06-07 Honeywell Limited-Honeywell Limitée 35 Dynamic Drive...

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